Printing-press



(No Model.)

P. S. DODGE.

PRINTING PRESS.

No. 307,922; Patentd Nov. 11, 1884.

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PELEG S. DODGE, OF STANTON, MICHIGAN.

PRINTING-PRESS.

EPECIPICATION forming part of Letters Patent No. 307,922, dated November11. 188%.

Application filed June 30, 1883. (No model.)

To an whom, it may concern:

Be it known that I, PELEG S. Donen, ofi Stanton, in the county ofMontcalm and State of Michigan, have invented certain new and usefulImprovements in Printing-Presses, of which the following is a full,clear, and exact description.

This invention relates to printing-presses in which areetilinearly-reciprocating form-bed is used in connect-ion with arotating impression-cylinder.

The invention consists in the combination and arrangement of parts, ashereinafter fully described, and pointed out in the claims.

Reference is to be had to the accompanying drawings, forming part ofthis specification, in which similar letters of reference indicatecorresponding parts in both the figures.

Figure 1 represents a partly-sectional longitudinal elevation of suchparts of a print-ingpress, with attached engine, as are necessary toillustrate my invention, and Fig. 2 a partlysectional plan of the same.

A is the frame of the machine, having in its sides grooves or ways I),for the longitudinallyreciprocating bed B, on which the form is placed.

0 is the impression-cylinder mounted over the bed B, and arranged torotate within bearings in uprights c c on opposite sides of the frame.

D is the steam-cylinder of a direct-acting horizontal steam-engine,arranged within the frame A, at or near one end thereof, and inlongitudinal direction with the frame and bed B, or it may be otherwiseequivalently arranged below the bed. The piston of this engine has astroke equal to one-half of the circumference of the impression-cylinderO, and the rod n of said piston is connected directly by an arm (Z withthe form-bed B, which, working in the ways 1), acts also as thecross-head of the engine, thus dispensing with a separate cross-head andall complicated mechanism to reciprocate the bed also making the sameways or guides answer for both the piston cross-head of the engine andform-bed, and generally reducing friction, as well as applying the powermore directly to the bed. Said engine may be fitted with any suitablevalves, valve-motion, and governor; but as such form no part of thisinvention it is not deemed necessary here to show or describe them, noryet those parts of the printing-press which have no bearing upon thisinvention-such as the inking apparatus, deliverygrippers, and othernecessary devicesand which may be the same as those in common use. Overonehalf, too, of the impression-cylinder may be of reduced diameter topermit return of the bed and type-forms.

The bearings of the shafte of the impression cylinder may be madeadjustable up and down by upper and lower set-screws in the stand ardswhich carry said bearings.

E is an arched or other suitably-shaped upward support or frame-pieceattached to one side of the bed B, and which may extend from oppositeends of the bed outside of the upright 0. This support carries a fixedor vertically-adjustable grooved cam, G, which is arranged transverselyto the axis of the cylinder 0, outside of the end of its shaft.

Fitted fast on the end of the cylinder-shaft c, contiguous to said cam,is a crank, H, the wrist-pin h of which is arranged to travel within thegroove f in the inner face of the cam. The shape of this groove willvary some according to the length of the crank; but it will consist,substantially, of four angling courses converging toward one another,and connecting with each other to form a continuous groove. Theseangling courses, which may be slightly arched inward in direction oftheir length, present sharp or only slightlyrounded inner marginalterminations, s s, on opposite sides of the cam, and the remaining orupper and lower angling portions, 8 s, of the groove may be of convexshape in an outward direction, or of sharp shape, if desired, all asshown in Fig. 1 of the drawings.

Pivoted, as at i i, to the grooved face of the cam in opposite relationwith each other are wings or guides I I, closed by springs k 76 againststopsl Z, and arranged so that their free ends, when closed by thesprings, form a continuation of the opposite inner walls of the grooveand prevent a return of the crank-pin to the portion of the groove cutoff, as shown in Fig. 1, and so that as the cam Gis reciprocated, inconnection with the bed B, the walls of the groove in the cam actingupon the Wrist or crank pin it will operate to rotate the crank, the pinit traveling in the groove f in the di rection indicated by the arrowsw, and pressing outward as they passthe wings or guides I I, which arereturned to their normal position by the spring k as soon as thecrank-pin has passed, so that as the motion of the cam Gis reversed,together with the bed B, said guides will prevent the crank-pin fromreturning into the section of the groove from which it has passed, andwill direct it to continue in the same forward continuous course, asindicated by the arrows :0. In some cases the guides I I might bedispensed with. This grooved cam and crank movement is free fromdead-center resistance and gives a more favorable angular action on thecrank than does a crank and pitman motion, making the work easier, andby it the reciprocating rectilinear motion of the bed B is made to givea rotary motion to the cylinder 0, and the circumference of saidcylinder is made to move through the same amount of space in the sametime as does the form-bed and the piston-head of the engine. For thispurpose and to secure a proper action, while the shape of the groovedportion of the cam G may be more or less varied, its width verticallyshould be less than its length and equal to the diameter of the circledescribed by the crank-pin h and its opposite length, as shown hereequal to about one and a quarter times the diameter of the circledescribed by the crank-pin, which will then have the full stroke ormotion of the bed. As the crank is longer or shorter in proportion tothe stroke of the form-bed, the vertical and longitudinal dimensions ofthe cam-groove will increase or diminish and its cycles become more orless curved and its angles sharper or more obtuse.

On the opposite end of the cylinder 0 to that which carries the crank isa toothed segment, m, extending a little less than one-half of thecircumference of the cylinder, arranged to gear with a rack, J, on thebed. This rack and segment-gear might be dispensed with;

but when used it aids and acts in unison with the cam G and crank H whenthe machine is laboring, equalizing strain on the different parts andassisting in effecting a perfect register.

The direct connection of the engine with the form-bed, as described,renders unnecessary coil-springs, air eushions, and other devices toprevent jar or clash at the ends of the bedstroke, at least such devicesas usually employed may be dispensed with, if desired, as the valve ofthe engine may be so set that the cushioning of the piston by the steamin the cylinder will effect the desired result.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a printing-press, the combination, with a reciprocating bed, animpression-cylinder, and means, substantially as described, forreciprocating the bed, of a cam on said bed for communicating rotarymotion to the cylinder during the reciprocating movement of the bed, asset forth.

- 2. The combination of a direct-acting piston-engine with the form-bed13, attached to the piston-rod of the engine and reciprocating in commonwith the engine-piston, the

grooved cam G, attached to said bed for move ment in concert with it,the impression-cylinder O, and the crank H, arranged to engage with thegroove in the cam for operation of said cylinder by and in unison withthebed, cssentially as shown and described.

3. The combination of the impression-cylinder 0, provided with atoothedsegment, m, the reciprocating bed B, having a rack, J, arranged toengage with said segment, the crank H, and the reciprocating grooved camG, substantially as and for the purposes specified.

PELEG S. DODGE.

Witnesses:

CHARLES S. AUs'rIN, NEWTON W. NEWI-IOUSE.

